170229682921 has 3 divisors (see below), whose sum is σ = 170230095511. Its totient is φ = 170229270332.

The previous prime is 170229682901. The next prime is 170229682939. The reversal of 170229682921 is 129286922071.

It is a happy number.

The square root of 170229682921 is 412589.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 87297202521 + 82932480400 = 295461^2 + 287980^2 .

It is not a de Polignac number, because 170229682921 - 2¹³ = 170229674729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (170229682901) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 206295 + ... + 618883.

Almost surely, 2^170229682921 is an apocalyptic number.

170229682921 is the 412589-th square number.

170229682921 is the 206295-th centered octagonal number.

It is an amenable number.

170229682921 is a deficient number, since it is larger than the sum of its proper divisors (412590).

170229682921 is an frugal number, since it uses more digits than its factorization.

170229682921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825178 (or 412589 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 49.

Multiplying 170229682921 by its sum of digits (49), we get a square (8341254463129 = 2888123²).

The spelling of 170229682921 in words is "one hundred seventy billion, two hundred twenty-nine million, six hundred eighty-two thousand, nine hundred twenty-one".